A spring-loaded, push-on inflation system compatible with all 3/8" threaded compressed gas cartridges and works for Presta or Shrader valves.Two 20 gram CO2 steel cartridgesPress-on for both Presta and Schrader valvesCompact, lightweight and durableCompatible with standard 3/8" threaded compressed gas cartridgesCNC-machined aluminum Inflator headItem SpecificationsCartridge TypeThreadedIncluded CartridgeYes MSW Windstream Push Inflator CO2 and Pressurized Inflation Device UPC: 708752203785